net/tipc/bearer.c

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This source file includes following definitions.
bearer_get
tipc_media_find
media_find_id
tipc_media_addr_printf
bearer_name_validate
tipc_bearer_find
tipc_bearer_get_name
tipc_bearer_add_dest
tipc_bearer_remove_dest
tipc_enable_bearer
tipc_reset_bearer
bearer_disable
tipc_enable_l2_media
tipc_disable_l2_media
tipc_l2_send_msg
tipc_bearer_bcast_support
tipc_bearer_mtu
tipc_bearer_xmit_skb
tipc_bearer_xmit
tipc_bearer_bc_xmit
tipc_l2_rcv_msg
tipc_l2_device_event
tipc_bearer_setup
tipc_bearer_cleanup
tipc_bearer_stop
tipc_clone_to_loopback
tipc_loopback_rcv_pkt
tipc_attach_loopback
tipc_detach_loopback
__tipc_nl_add_bearer
tipc_nl_bearer_dump
tipc_nl_bearer_get
__tipc_nl_bearer_disable
tipc_nl_bearer_disable
__tipc_nl_bearer_enable
tipc_nl_bearer_enable
tipc_nl_bearer_add
__tipc_nl_bearer_set
tipc_nl_bearer_set
__tipc_nl_add_media
tipc_nl_media_dump
tipc_nl_media_get
__tipc_nl_media_set
tipc_nl_media_set
   1 /*
   2  * net/tipc/bearer.c: TIPC bearer code
   3  *
   4  * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
   5  * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36 
  37 #include <net/sock.h>
  38 #include "core.h"
  39 #include "bearer.h"
  40 #include "link.h"
  41 #include "discover.h"
  42 #include "monitor.h"
  43 #include "bcast.h"
  44 #include "netlink.h"
  45 #include "udp_media.h"
  46 #include "trace.h"
  47 
  48 #define MAX_ADDR_STR 60
  49 
  50 static struct tipc_media * const media_info_array[] = {
  51         &eth_media_info,
  52 #ifdef CONFIG_TIPC_MEDIA_IB
  53         &ib_media_info,
  54 #endif
  55 #ifdef CONFIG_TIPC_MEDIA_UDP
  56         &udp_media_info,
  57 #endif
  58         NULL
  59 };
  60 
  61 static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
  62 {
  63         struct tipc_net *tn = tipc_net(net);
  64 
  65         return rcu_dereference(tn->bearer_list[bearer_id]);
  66 }
  67 
  68 static void bearer_disable(struct net *net, struct tipc_bearer *b);
  69 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
  70                            struct packet_type *pt, struct net_device *orig_dev);
  71 
  72 /**
  73  * tipc_media_find - locates specified media object by name
  74  */
  75 struct tipc_media *tipc_media_find(const char *name)
  76 {
  77         u32 i;
  78 
  79         for (i = 0; media_info_array[i] != NULL; i++) {
  80                 if (!strcmp(media_info_array[i]->name, name))
  81                         break;
  82         }
  83         return media_info_array[i];
  84 }
  85 
  86 /**
  87  * media_find_id - locates specified media object by type identifier
  88  */
  89 static struct tipc_media *media_find_id(u8 type)
  90 {
  91         u32 i;
  92 
  93         for (i = 0; media_info_array[i] != NULL; i++) {
  94                 if (media_info_array[i]->type_id == type)
  95                         break;
  96         }
  97         return media_info_array[i];
  98 }
  99 
 100 /**
 101  * tipc_media_addr_printf - record media address in print buffer
 102  */
 103 int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
 104 {
 105         char addr_str[MAX_ADDR_STR];
 106         struct tipc_media *m;
 107         int ret;
 108 
 109         m = media_find_id(a->media_id);
 110 
 111         if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
 112                 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
 113         else {
 114                 u32 i;
 115 
 116                 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
 117                 for (i = 0; i < sizeof(a->value); i++)
 118                         ret += scnprintf(buf + ret, len - ret,
 119                                             "-%x", a->value[i]);
 120         }
 121         return ret;
 122 }
 123 
 124 /**
 125  * bearer_name_validate - validate & (optionally) deconstruct bearer name
 126  * @name: ptr to bearer name string
 127  * @name_parts: ptr to area for bearer name components (or NULL if not needed)
 128  *
 129  * Returns 1 if bearer name is valid, otherwise 0.
 130  */
 131 static int bearer_name_validate(const char *name,
 132                                 struct tipc_bearer_names *name_parts)
 133 {
 134         char name_copy[TIPC_MAX_BEARER_NAME];
 135         char *media_name;
 136         char *if_name;
 137         u32 media_len;
 138         u32 if_len;
 139 
 140         /* copy bearer name & ensure length is OK */
 141         name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
 142         /* need above in case non-Posix strncpy() doesn't pad with nulls */
 143         strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
 144         if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
 145                 return 0;
 146 
 147         /* ensure all component parts of bearer name are present */
 148         media_name = name_copy;
 149         if_name = strchr(media_name, ':');
 150         if (if_name == NULL)
 151                 return 0;
 152         *(if_name++) = 0;
 153         media_len = if_name - media_name;
 154         if_len = strlen(if_name) + 1;
 155 
 156         /* validate component parts of bearer name */
 157         if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
 158             (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
 159                 return 0;
 160 
 161         /* return bearer name components, if necessary */
 162         if (name_parts) {
 163                 strcpy(name_parts->media_name, media_name);
 164                 strcpy(name_parts->if_name, if_name);
 165         }
 166         return 1;
 167 }
 168 
 169 /**
 170  * tipc_bearer_find - locates bearer object with matching bearer name
 171  */
 172 struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
 173 {
 174         struct tipc_net *tn = net_generic(net, tipc_net_id);
 175         struct tipc_bearer *b;
 176         u32 i;
 177 
 178         for (i = 0; i < MAX_BEARERS; i++) {
 179                 b = rtnl_dereference(tn->bearer_list[i]);
 180                 if (b && (!strcmp(b->name, name)))
 181                         return b;
 182         }
 183         return NULL;
 184 }
 185 
 186 /*     tipc_bearer_get_name - get the bearer name from its id.
 187  *     @net: network namespace
 188  *     @name: a pointer to the buffer where the name will be stored.
 189  *     @bearer_id: the id to get the name from.
 190  */
 191 int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
 192 {
 193         struct tipc_net *tn = tipc_net(net);
 194         struct tipc_bearer *b;
 195 
 196         if (bearer_id >= MAX_BEARERS)
 197                 return -EINVAL;
 198 
 199         b = rtnl_dereference(tn->bearer_list[bearer_id]);
 200         if (!b)
 201                 return -EINVAL;
 202 
 203         strcpy(name, b->name);
 204         return 0;
 205 }
 206 
 207 void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 208 {
 209         struct tipc_net *tn = net_generic(net, tipc_net_id);
 210         struct tipc_bearer *b;
 211 
 212         rcu_read_lock();
 213         b = rcu_dereference(tn->bearer_list[bearer_id]);
 214         if (b)
 215                 tipc_disc_add_dest(b->disc);
 216         rcu_read_unlock();
 217 }
 218 
 219 void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 220 {
 221         struct tipc_net *tn = net_generic(net, tipc_net_id);
 222         struct tipc_bearer *b;
 223 
 224         rcu_read_lock();
 225         b = rcu_dereference(tn->bearer_list[bearer_id]);
 226         if (b)
 227                 tipc_disc_remove_dest(b->disc);
 228         rcu_read_unlock();
 229 }
 230 
 231 /**
 232  * tipc_enable_bearer - enable bearer with the given name
 233  */
 234 static int tipc_enable_bearer(struct net *net, const char *name,
 235                               u32 disc_domain, u32 prio,
 236                               struct nlattr *attr[])
 237 {
 238         struct tipc_net *tn = tipc_net(net);
 239         struct tipc_bearer_names b_names;
 240         int with_this_prio = 1;
 241         struct tipc_bearer *b;
 242         struct tipc_media *m;
 243         struct sk_buff *skb;
 244         int bearer_id = 0;
 245         int res = -EINVAL;
 246         char *errstr = "";
 247 
 248         if (!bearer_name_validate(name, &b_names)) {
 249                 errstr = "illegal name";
 250                 goto rejected;
 251         }
 252 
 253         if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
 254                 errstr = "illegal priority";
 255                 goto rejected;
 256         }
 257 
 258         m = tipc_media_find(b_names.media_name);
 259         if (!m) {
 260                 errstr = "media not registered";
 261                 goto rejected;
 262         }
 263 
 264         if (prio == TIPC_MEDIA_LINK_PRI)
 265                 prio = m->priority;
 266 
 267         /* Check new bearer vs existing ones and find free bearer id if any */
 268         while (bearer_id < MAX_BEARERS) {
 269                 b = rtnl_dereference(tn->bearer_list[bearer_id]);
 270                 if (!b)
 271                         break;
 272                 if (!strcmp(name, b->name)) {
 273                         errstr = "already enabled";
 274                         goto rejected;
 275                 }
 276                 bearer_id++;
 277                 if (b->priority != prio)
 278                         continue;
 279                 if (++with_this_prio <= 2)
 280                         continue;
 281                 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
 282                         name, prio);
 283                 if (prio == TIPC_MIN_LINK_PRI) {
 284                         errstr = "cannot adjust to lower";
 285                         goto rejected;
 286                 }
 287                 pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
 288                 prio--;
 289                 bearer_id = 0;
 290                 with_this_prio = 1;
 291         }
 292 
 293         if (bearer_id >= MAX_BEARERS) {
 294                 errstr = "max 3 bearers permitted";
 295                 goto rejected;
 296         }
 297 
 298         b = kzalloc(sizeof(*b), GFP_ATOMIC);
 299         if (!b)
 300                 return -ENOMEM;
 301 
 302         strcpy(b->name, name);
 303         b->media = m;
 304         res = m->enable_media(net, b, attr);
 305         if (res) {
 306                 kfree(b);
 307                 errstr = "failed to enable media";
 308                 goto rejected;
 309         }
 310 
 311         b->identity = bearer_id;
 312         b->tolerance = m->tolerance;
 313         b->window = m->window;
 314         b->domain = disc_domain;
 315         b->net_plane = bearer_id + 'A';
 316         b->priority = prio;
 317         test_and_set_bit_lock(0, &b->up);
 318 
 319         res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
 320         if (res) {
 321                 bearer_disable(net, b);
 322                 errstr = "failed to create discoverer";
 323                 goto rejected;
 324         }
 325 
 326         rcu_assign_pointer(tn->bearer_list[bearer_id], b);
 327         if (skb)
 328                 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
 329 
 330         if (tipc_mon_create(net, bearer_id)) {
 331                 bearer_disable(net, b);
 332                 return -ENOMEM;
 333         }
 334 
 335         pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
 336 
 337         return res;
 338 rejected:
 339         pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
 340         return res;
 341 }
 342 
 343 /**
 344  * tipc_reset_bearer - Reset all links established over this bearer
 345  */
 346 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
 347 {
 348         pr_info("Resetting bearer <%s>\n", b->name);
 349         tipc_node_delete_links(net, b->identity);
 350         tipc_disc_reset(net, b);
 351         return 0;
 352 }
 353 
 354 /**
 355  * bearer_disable
 356  *
 357  * Note: This routine assumes caller holds RTNL lock.
 358  */
 359 static void bearer_disable(struct net *net, struct tipc_bearer *b)
 360 {
 361         struct tipc_net *tn = tipc_net(net);
 362         int bearer_id = b->identity;
 363 
 364         pr_info("Disabling bearer <%s>\n", b->name);
 365         clear_bit_unlock(0, &b->up);
 366         tipc_node_delete_links(net, bearer_id);
 367         b->media->disable_media(b);
 368         RCU_INIT_POINTER(b->media_ptr, NULL);
 369         if (b->disc)
 370                 tipc_disc_delete(b->disc);
 371         RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 372         kfree_rcu(b, rcu);
 373         tipc_mon_delete(net, bearer_id);
 374 }
 375 
 376 int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
 377                          struct nlattr *attr[])
 378 {
 379         char *dev_name = strchr((const char *)b->name, ':') + 1;
 380         int hwaddr_len = b->media->hwaddr_len;
 381         u8 node_id[NODE_ID_LEN] = {0,};
 382         struct net_device *dev;
 383 
 384         /* Find device with specified name */
 385         dev = dev_get_by_name(net, dev_name);
 386         if (!dev)
 387                 return -ENODEV;
 388         if (tipc_mtu_bad(dev, 0)) {
 389                 dev_put(dev);
 390                 return -EINVAL;
 391         }
 392         if (dev == net->loopback_dev) {
 393                 dev_put(dev);
 394                 pr_info("Enabling <%s> not permitted\n", b->name);
 395                 return -EINVAL;
 396         }
 397 
 398         /* Autoconfigure own node identity if needed */
 399         if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
 400                 memcpy(node_id, dev->dev_addr, hwaddr_len);
 401                 tipc_net_init(net, node_id, 0);
 402         }
 403         if (!tipc_own_id(net)) {
 404                 dev_put(dev);
 405                 pr_warn("Failed to obtain node identity\n");
 406                 return -EINVAL;
 407         }
 408 
 409         /* Associate TIPC bearer with L2 bearer */
 410         rcu_assign_pointer(b->media_ptr, dev);
 411         b->pt.dev = dev;
 412         b->pt.type = htons(ETH_P_TIPC);
 413         b->pt.func = tipc_l2_rcv_msg;
 414         dev_add_pack(&b->pt);
 415         memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
 416         memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
 417         b->bcast_addr.media_id = b->media->type_id;
 418         b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
 419         b->mtu = dev->mtu;
 420         b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
 421         rcu_assign_pointer(dev->tipc_ptr, b);
 422         return 0;
 423 }
 424 
 425 /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
 426  *
 427  * Mark L2 bearer as inactive so that incoming buffers are thrown away
 428  */
 429 void tipc_disable_l2_media(struct tipc_bearer *b)
 430 {
 431         struct net_device *dev;
 432 
 433         dev = (struct net_device *)rtnl_dereference(b->media_ptr);
 434         dev_remove_pack(&b->pt);
 435         RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 436         synchronize_net();
 437         dev_put(dev);
 438 }
 439 
 440 /**
 441  * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
 442  * @skb: the packet to be sent
 443  * @b: the bearer through which the packet is to be sent
 444  * @dest: peer destination address
 445  */
 446 int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
 447                      struct tipc_bearer *b, struct tipc_media_addr *dest)
 448 {
 449         struct net_device *dev;
 450         int delta;
 451 
 452         dev = (struct net_device *)rcu_dereference(b->media_ptr);
 453         if (!dev)
 454                 return 0;
 455 
 456         delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
 457         if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
 458                 kfree_skb(skb);
 459                 return 0;
 460         }
 461         skb_reset_network_header(skb);
 462         skb->dev = dev;
 463         skb->protocol = htons(ETH_P_TIPC);
 464         dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
 465                         dev->dev_addr, skb->len);
 466         dev_queue_xmit(skb);
 467         return 0;
 468 }
 469 
 470 bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
 471 {
 472         bool supp = false;
 473         struct tipc_bearer *b;
 474 
 475         rcu_read_lock();
 476         b = bearer_get(net, bearer_id);
 477         if (b)
 478                 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
 479         rcu_read_unlock();
 480         return supp;
 481 }
 482 
 483 int tipc_bearer_mtu(struct net *net, u32 bearer_id)
 484 {
 485         int mtu = 0;
 486         struct tipc_bearer *b;
 487 
 488         rcu_read_lock();
 489         b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
 490         if (b)
 491                 mtu = b->mtu;
 492         rcu_read_unlock();
 493         return mtu;
 494 }
 495 
 496 /* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 497  */
 498 void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
 499                           struct sk_buff *skb,
 500                           struct tipc_media_addr *dest)
 501 {
 502         struct tipc_msg *hdr = buf_msg(skb);
 503         struct tipc_bearer *b;
 504 
 505         rcu_read_lock();
 506         b = bearer_get(net, bearer_id);
 507         if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
 508                 b->media->send_msg(net, skb, b, dest);
 509         else
 510                 kfree_skb(skb);
 511         rcu_read_unlock();
 512 }
 513 
 514 /* tipc_bearer_xmit() -send buffer to destination over bearer
 515  */
 516 void tipc_bearer_xmit(struct net *net, u32 bearer_id,
 517                       struct sk_buff_head *xmitq,
 518                       struct tipc_media_addr *dst)
 519 {
 520         struct tipc_bearer *b;
 521         struct sk_buff *skb, *tmp;
 522 
 523         if (skb_queue_empty(xmitq))
 524                 return;
 525 
 526         rcu_read_lock();
 527         b = bearer_get(net, bearer_id);
 528         if (unlikely(!b))
 529                 __skb_queue_purge(xmitq);
 530         skb_queue_walk_safe(xmitq, skb, tmp) {
 531                 __skb_dequeue(xmitq);
 532                 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
 533                         b->media->send_msg(net, skb, b, dst);
 534                 else
 535                         kfree_skb(skb);
 536         }
 537         rcu_read_unlock();
 538 }
 539 
 540 /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 541  */
 542 void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
 543                          struct sk_buff_head *xmitq)
 544 {
 545         struct tipc_net *tn = tipc_net(net);
 546         int net_id = tn->net_id;
 547         struct tipc_bearer *b;
 548         struct sk_buff *skb, *tmp;
 549         struct tipc_msg *hdr;
 550 
 551         rcu_read_lock();
 552         b = bearer_get(net, bearer_id);
 553         if (unlikely(!b || !test_bit(0, &b->up)))
 554                 __skb_queue_purge(xmitq);
 555         skb_queue_walk_safe(xmitq, skb, tmp) {
 556                 hdr = buf_msg(skb);
 557                 msg_set_non_seq(hdr, 1);
 558                 msg_set_mc_netid(hdr, net_id);
 559                 __skb_dequeue(xmitq);
 560                 b->media->send_msg(net, skb, b, &b->bcast_addr);
 561         }
 562         rcu_read_unlock();
 563 }
 564 
 565 /**
 566  * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 567  * @buf: the received packet
 568  * @dev: the net device that the packet was received on
 569  * @pt: the packet_type structure which was used to register this handler
 570  * @orig_dev: the original receive net device in case the device is a bond
 571  *
 572  * Accept only packets explicitly sent to this node, or broadcast packets;
 573  * ignores packets sent using interface multicast, and traffic sent to other
 574  * nodes (which can happen if interface is running in promiscuous mode).
 575  */
 576 static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
 577                            struct packet_type *pt, struct net_device *orig_dev)
 578 {
 579         struct tipc_bearer *b;
 580 
 581         rcu_read_lock();
 582         b = rcu_dereference(dev->tipc_ptr) ?:
 583                 rcu_dereference(orig_dev->tipc_ptr);
 584         if (likely(b && test_bit(0, &b->up) &&
 585                    (skb->pkt_type <= PACKET_MULTICAST))) {
 586                 skb_mark_not_on_list(skb);
 587                 tipc_rcv(dev_net(b->pt.dev), skb, b);
 588                 rcu_read_unlock();
 589                 return NET_RX_SUCCESS;
 590         }
 591         rcu_read_unlock();
 592         kfree_skb(skb);
 593         return NET_RX_DROP;
 594 }
 595 
 596 /**
 597  * tipc_l2_device_event - handle device events from network device
 598  * @nb: the context of the notification
 599  * @evt: the type of event
 600  * @ptr: the net device that the event was on
 601  *
 602  * This function is called by the Ethernet driver in case of link
 603  * change event.
 604  */
 605 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 606                                 void *ptr)
 607 {
 608         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 609         struct net *net = dev_net(dev);
 610         struct tipc_bearer *b;
 611 
 612         b = rtnl_dereference(dev->tipc_ptr);
 613         if (!b)
 614                 return NOTIFY_DONE;
 615 
 616         trace_tipc_l2_device_event(dev, b, evt);
 617         switch (evt) {
 618         case NETDEV_CHANGE:
 619                 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
 620                         test_and_set_bit_lock(0, &b->up);
 621                         break;
 622                 }
 623                 /* fall through */
 624         case NETDEV_GOING_DOWN:
 625                 clear_bit_unlock(0, &b->up);
 626                 tipc_reset_bearer(net, b);
 627                 break;
 628         case NETDEV_UP:
 629                 test_and_set_bit_lock(0, &b->up);
 630                 break;
 631         case NETDEV_CHANGEMTU:
 632                 if (tipc_mtu_bad(dev, 0)) {
 633                         bearer_disable(net, b);
 634                         break;
 635                 }
 636                 b->mtu = dev->mtu;
 637                 tipc_reset_bearer(net, b);
 638                 break;
 639         case NETDEV_CHANGEADDR:
 640                 b->media->raw2addr(b, &b->addr,
 641                                    (char *)dev->dev_addr);
 642                 tipc_reset_bearer(net, b);
 643                 break;
 644         case NETDEV_UNREGISTER:
 645         case NETDEV_CHANGENAME:
 646                 bearer_disable(net, b);
 647                 break;
 648         }
 649         return NOTIFY_OK;
 650 }
 651 
 652 static struct notifier_block notifier = {
 653         .notifier_call  = tipc_l2_device_event,
 654         .priority       = 0,
 655 };
 656 
 657 int tipc_bearer_setup(void)
 658 {
 659         return register_netdevice_notifier(&notifier);
 660 }
 661 
 662 void tipc_bearer_cleanup(void)
 663 {
 664         unregister_netdevice_notifier(&notifier);
 665 }
 666 
 667 void tipc_bearer_stop(struct net *net)
 668 {
 669         struct tipc_net *tn = net_generic(net, tipc_net_id);
 670         struct tipc_bearer *b;
 671         u32 i;
 672 
 673         for (i = 0; i < MAX_BEARERS; i++) {
 674                 b = rtnl_dereference(tn->bearer_list[i]);
 675                 if (b) {
 676                         bearer_disable(net, b);
 677                         tn->bearer_list[i] = NULL;
 678                 }
 679         }
 680 }
 681 
 682 void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
 683 {
 684         struct net_device *dev = net->loopback_dev;
 685         struct sk_buff *skb, *_skb;
 686         int exp;
 687 
 688         skb_queue_walk(pkts, _skb) {
 689                 skb = pskb_copy(_skb, GFP_ATOMIC);
 690                 if (!skb)
 691                         continue;
 692 
 693                 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
 694                 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
 695                         kfree_skb(skb);
 696                         continue;
 697                 }
 698 
 699                 skb_reset_network_header(skb);
 700                 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
 701                                 dev->dev_addr, skb->len);
 702                 skb->dev = dev;
 703                 skb->pkt_type = PACKET_HOST;
 704                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 705                 skb->protocol = eth_type_trans(skb, dev);
 706                 netif_rx_ni(skb);
 707         }
 708 }
 709 
 710 static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
 711                                  struct packet_type *pt, struct net_device *od)
 712 {
 713         consume_skb(skb);
 714         return NET_RX_SUCCESS;
 715 }
 716 
 717 int tipc_attach_loopback(struct net *net)
 718 {
 719         struct net_device *dev = net->loopback_dev;
 720         struct tipc_net *tn = tipc_net(net);
 721 
 722         if (!dev)
 723                 return -ENODEV;
 724 
 725         dev_hold(dev);
 726         tn->loopback_pt.dev = dev;
 727         tn->loopback_pt.type = htons(ETH_P_TIPC);
 728         tn->loopback_pt.func = tipc_loopback_rcv_pkt;
 729         dev_add_pack(&tn->loopback_pt);
 730         return 0;
 731 }
 732 
 733 void tipc_detach_loopback(struct net *net)
 734 {
 735         struct tipc_net *tn = tipc_net(net);
 736 
 737         dev_remove_pack(&tn->loopback_pt);
 738         dev_put(net->loopback_dev);
 739 }
 740 
 741 /* Caller should hold rtnl_lock to protect the bearer */
 742 static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
 743                                 struct tipc_bearer *bearer, int nlflags)
 744 {
 745         void *hdr;
 746         struct nlattr *attrs;
 747         struct nlattr *prop;
 748 
 749         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 750                           nlflags, TIPC_NL_BEARER_GET);
 751         if (!hdr)
 752                 return -EMSGSIZE;
 753 
 754         attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
 755         if (!attrs)
 756                 goto msg_full;
 757 
 758         if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
 759                 goto attr_msg_full;
 760 
 761         prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
 762         if (!prop)
 763                 goto prop_msg_full;
 764         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
 765                 goto prop_msg_full;
 766         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
 767                 goto prop_msg_full;
 768         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
 769                 goto prop_msg_full;
 770         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
 771                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
 772                         goto prop_msg_full;
 773 
 774         nla_nest_end(msg->skb, prop);
 775 
 776 #ifdef CONFIG_TIPC_MEDIA_UDP
 777         if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
 778                 if (tipc_udp_nl_add_bearer_data(msg, bearer))
 779                         goto attr_msg_full;
 780         }
 781 #endif
 782 
 783         nla_nest_end(msg->skb, attrs);
 784         genlmsg_end(msg->skb, hdr);
 785 
 786         return 0;
 787 
 788 prop_msg_full:
 789         nla_nest_cancel(msg->skb, prop);
 790 attr_msg_full:
 791         nla_nest_cancel(msg->skb, attrs);
 792 msg_full:
 793         genlmsg_cancel(msg->skb, hdr);
 794 
 795         return -EMSGSIZE;
 796 }
 797 
 798 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
 799 {
 800         int err;
 801         int i = cb->args[0];
 802         struct tipc_bearer *bearer;
 803         struct tipc_nl_msg msg;
 804         struct net *net = sock_net(skb->sk);
 805         struct tipc_net *tn = net_generic(net, tipc_net_id);
 806 
 807         if (i == MAX_BEARERS)
 808                 return 0;
 809 
 810         msg.skb = skb;
 811         msg.portid = NETLINK_CB(cb->skb).portid;
 812         msg.seq = cb->nlh->nlmsg_seq;
 813 
 814         rtnl_lock();
 815         for (i = 0; i < MAX_BEARERS; i++) {
 816                 bearer = rtnl_dereference(tn->bearer_list[i]);
 817                 if (!bearer)
 818                         continue;
 819 
 820                 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
 821                 if (err)
 822                         break;
 823         }
 824         rtnl_unlock();
 825 
 826         cb->args[0] = i;
 827         return skb->len;
 828 }
 829 
 830 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 831 {
 832         int err;
 833         char *name;
 834         struct sk_buff *rep;
 835         struct tipc_bearer *bearer;
 836         struct tipc_nl_msg msg;
 837         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 838         struct net *net = genl_info_net(info);
 839 
 840         if (!info->attrs[TIPC_NLA_BEARER])
 841                 return -EINVAL;
 842 
 843         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
 844                                           info->attrs[TIPC_NLA_BEARER],
 845                                           tipc_nl_bearer_policy, info->extack);
 846         if (err)
 847                 return err;
 848 
 849         if (!attrs[TIPC_NLA_BEARER_NAME])
 850                 return -EINVAL;
 851         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 852 
 853         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 854         if (!rep)
 855                 return -ENOMEM;
 856 
 857         msg.skb = rep;
 858         msg.portid = info->snd_portid;
 859         msg.seq = info->snd_seq;
 860 
 861         rtnl_lock();
 862         bearer = tipc_bearer_find(net, name);
 863         if (!bearer) {
 864                 err = -EINVAL;
 865                 goto err_out;
 866         }
 867 
 868         err = __tipc_nl_add_bearer(&msg, bearer, 0);
 869         if (err)
 870                 goto err_out;
 871         rtnl_unlock();
 872 
 873         return genlmsg_reply(rep, info);
 874 err_out:
 875         rtnl_unlock();
 876         nlmsg_free(rep);
 877 
 878         return err;
 879 }
 880 
 881 int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 882 {
 883         int err;
 884         char *name;
 885         struct tipc_bearer *bearer;
 886         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 887         struct net *net = sock_net(skb->sk);
 888 
 889         if (!info->attrs[TIPC_NLA_BEARER])
 890                 return -EINVAL;
 891 
 892         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
 893                                           info->attrs[TIPC_NLA_BEARER],
 894                                           tipc_nl_bearer_policy, info->extack);
 895         if (err)
 896                 return err;
 897 
 898         if (!attrs[TIPC_NLA_BEARER_NAME])
 899                 return -EINVAL;
 900 
 901         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 902 
 903         bearer = tipc_bearer_find(net, name);
 904         if (!bearer)
 905                 return -EINVAL;
 906 
 907         bearer_disable(net, bearer);
 908 
 909         return 0;
 910 }
 911 
 912 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 913 {
 914         int err;
 915 
 916         rtnl_lock();
 917         err = __tipc_nl_bearer_disable(skb, info);
 918         rtnl_unlock();
 919 
 920         return err;
 921 }
 922 
 923 int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 924 {
 925         int err;
 926         char *bearer;
 927         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 928         struct net *net = sock_net(skb->sk);
 929         u32 domain = 0;
 930         u32 prio;
 931 
 932         prio = TIPC_MEDIA_LINK_PRI;
 933 
 934         if (!info->attrs[TIPC_NLA_BEARER])
 935                 return -EINVAL;
 936 
 937         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
 938                                           info->attrs[TIPC_NLA_BEARER],
 939                                           tipc_nl_bearer_policy, info->extack);
 940         if (err)
 941                 return err;
 942 
 943         if (!attrs[TIPC_NLA_BEARER_NAME])
 944                 return -EINVAL;
 945 
 946         bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 947 
 948         if (attrs[TIPC_NLA_BEARER_DOMAIN])
 949                 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
 950 
 951         if (attrs[TIPC_NLA_BEARER_PROP]) {
 952                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 953 
 954                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
 955                                               props);
 956                 if (err)
 957                         return err;
 958 
 959                 if (props[TIPC_NLA_PROP_PRIO])
 960                         prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
 961         }
 962 
 963         return tipc_enable_bearer(net, bearer, domain, prio, attrs);
 964 }
 965 
 966 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 967 {
 968         int err;
 969 
 970         rtnl_lock();
 971         err = __tipc_nl_bearer_enable(skb, info);
 972         rtnl_unlock();
 973 
 974         return err;
 975 }
 976 
 977 int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
 978 {
 979         int err;
 980         char *name;
 981         struct tipc_bearer *b;
 982         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
 983         struct net *net = sock_net(skb->sk);
 984 
 985         if (!info->attrs[TIPC_NLA_BEARER])
 986                 return -EINVAL;
 987 
 988         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
 989                                           info->attrs[TIPC_NLA_BEARER],
 990                                           tipc_nl_bearer_policy, info->extack);
 991         if (err)
 992                 return err;
 993 
 994         if (!attrs[TIPC_NLA_BEARER_NAME])
 995                 return -EINVAL;
 996         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 997 
 998         rtnl_lock();
 999         b = tipc_bearer_find(net, name);
1000         if (!b) {
1001                 rtnl_unlock();
1002                 return -EINVAL;
1003         }
1004 
1005 #ifdef CONFIG_TIPC_MEDIA_UDP
1006         if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1007                 err = tipc_udp_nl_bearer_add(b,
1008                                              attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1009                 if (err) {
1010                         rtnl_unlock();
1011                         return err;
1012                 }
1013         }
1014 #endif
1015         rtnl_unlock();
1016 
1017         return 0;
1018 }
1019 
1020 int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1021 {
1022         struct tipc_bearer *b;
1023         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1024         struct net *net = sock_net(skb->sk);
1025         char *name;
1026         int err;
1027 
1028         if (!info->attrs[TIPC_NLA_BEARER])
1029                 return -EINVAL;
1030 
1031         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1032                                           info->attrs[TIPC_NLA_BEARER],
1033                                           tipc_nl_bearer_policy, info->extack);
1034         if (err)
1035                 return err;
1036 
1037         if (!attrs[TIPC_NLA_BEARER_NAME])
1038                 return -EINVAL;
1039         name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1040 
1041         b = tipc_bearer_find(net, name);
1042         if (!b)
1043                 return -EINVAL;
1044 
1045         if (attrs[TIPC_NLA_BEARER_PROP]) {
1046                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1047 
1048                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1049                                               props);
1050                 if (err)
1051                         return err;
1052 
1053                 if (props[TIPC_NLA_PROP_TOL]) {
1054                         b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1055                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1056                 }
1057                 if (props[TIPC_NLA_PROP_PRIO])
1058                         b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1059                 if (props[TIPC_NLA_PROP_WIN])
1060                         b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1061                 if (props[TIPC_NLA_PROP_MTU]) {
1062                         if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
1063                                 return -EINVAL;
1064 #ifdef CONFIG_TIPC_MEDIA_UDP
1065                         if (tipc_udp_mtu_bad(nla_get_u32
1066                                              (props[TIPC_NLA_PROP_MTU])))
1067                                 return -EINVAL;
1068                         b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1069                         tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1070 #endif
1071                 }
1072         }
1073 
1074         return 0;
1075 }
1076 
1077 int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1078 {
1079         int err;
1080 
1081         rtnl_lock();
1082         err = __tipc_nl_bearer_set(skb, info);
1083         rtnl_unlock();
1084 
1085         return err;
1086 }
1087 
1088 static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1089                                struct tipc_media *media, int nlflags)
1090 {
1091         void *hdr;
1092         struct nlattr *attrs;
1093         struct nlattr *prop;
1094 
1095         hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1096                           nlflags, TIPC_NL_MEDIA_GET);
1097         if (!hdr)
1098                 return -EMSGSIZE;
1099 
1100         attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1101         if (!attrs)
1102                 goto msg_full;
1103 
1104         if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1105                 goto attr_msg_full;
1106 
1107         prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1108         if (!prop)
1109                 goto prop_msg_full;
1110         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1111                 goto prop_msg_full;
1112         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1113                 goto prop_msg_full;
1114         if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
1115                 goto prop_msg_full;
1116         if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1117                 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1118                         goto prop_msg_full;
1119 
1120         nla_nest_end(msg->skb, prop);
1121         nla_nest_end(msg->skb, attrs);
1122         genlmsg_end(msg->skb, hdr);
1123 
1124         return 0;
1125 
1126 prop_msg_full:
1127         nla_nest_cancel(msg->skb, prop);
1128 attr_msg_full:
1129         nla_nest_cancel(msg->skb, attrs);
1130 msg_full:
1131         genlmsg_cancel(msg->skb, hdr);
1132 
1133         return -EMSGSIZE;
1134 }
1135 
1136 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1137 {
1138         int err;
1139         int i = cb->args[0];
1140         struct tipc_nl_msg msg;
1141 
1142         if (i == MAX_MEDIA)
1143                 return 0;
1144 
1145         msg.skb = skb;
1146         msg.portid = NETLINK_CB(cb->skb).portid;
1147         msg.seq = cb->nlh->nlmsg_seq;
1148 
1149         rtnl_lock();
1150         for (; media_info_array[i] != NULL; i++) {
1151                 err = __tipc_nl_add_media(&msg, media_info_array[i],
1152                                           NLM_F_MULTI);
1153                 if (err)
1154                         break;
1155         }
1156         rtnl_unlock();
1157 
1158         cb->args[0] = i;
1159         return skb->len;
1160 }
1161 
1162 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1163 {
1164         int err;
1165         char *name;
1166         struct tipc_nl_msg msg;
1167         struct tipc_media *media;
1168         struct sk_buff *rep;
1169         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1170 
1171         if (!info->attrs[TIPC_NLA_MEDIA])
1172                 return -EINVAL;
1173 
1174         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1175                                           info->attrs[TIPC_NLA_MEDIA],
1176                                           tipc_nl_media_policy, info->extack);
1177         if (err)
1178                 return err;
1179 
1180         if (!attrs[TIPC_NLA_MEDIA_NAME])
1181                 return -EINVAL;
1182         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1183 
1184         rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1185         if (!rep)
1186                 return -ENOMEM;
1187 
1188         msg.skb = rep;
1189         msg.portid = info->snd_portid;
1190         msg.seq = info->snd_seq;
1191 
1192         rtnl_lock();
1193         media = tipc_media_find(name);
1194         if (!media) {
1195                 err = -EINVAL;
1196                 goto err_out;
1197         }
1198 
1199         err = __tipc_nl_add_media(&msg, media, 0);
1200         if (err)
1201                 goto err_out;
1202         rtnl_unlock();
1203 
1204         return genlmsg_reply(rep, info);
1205 err_out:
1206         rtnl_unlock();
1207         nlmsg_free(rep);
1208 
1209         return err;
1210 }
1211 
1212 int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1213 {
1214         int err;
1215         char *name;
1216         struct tipc_media *m;
1217         struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1218 
1219         if (!info->attrs[TIPC_NLA_MEDIA])
1220                 return -EINVAL;
1221 
1222         err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1223                                           info->attrs[TIPC_NLA_MEDIA],
1224                                           tipc_nl_media_policy, info->extack);
1225 
1226         if (!attrs[TIPC_NLA_MEDIA_NAME])
1227                 return -EINVAL;
1228         name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1229 
1230         m = tipc_media_find(name);
1231         if (!m)
1232                 return -EINVAL;
1233 
1234         if (attrs[TIPC_NLA_MEDIA_PROP]) {
1235                 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1236 
1237                 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1238                                               props);
1239                 if (err)
1240                         return err;
1241 
1242                 if (props[TIPC_NLA_PROP_TOL])
1243                         m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1244                 if (props[TIPC_NLA_PROP_PRIO])
1245                         m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1246                 if (props[TIPC_NLA_PROP_WIN])
1247                         m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1248                 if (props[TIPC_NLA_PROP_MTU]) {
1249                         if (m->type_id != TIPC_MEDIA_TYPE_UDP)
1250                                 return -EINVAL;
1251 #ifdef CONFIG_TIPC_MEDIA_UDP
1252                         if (tipc_udp_mtu_bad(nla_get_u32
1253                                              (props[TIPC_NLA_PROP_MTU])))
1254                                 return -EINVAL;
1255                         m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1256 #endif
1257                 }
1258         }
1259 
1260         return 0;
1261 }
1262 
1263 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         int err;
1266 
1267         rtnl_lock();
1268         err = __tipc_nl_media_set(skb, info);
1269         rtnl_unlock();
1270 
1271         return err;
1272 }
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root/net/tipc/bearer.c

DEFINITIONS
